function s1_goto_dir(){
cd $1;
}

function s2_touch_empty_file_with_given_name(){
touch $1;
}

function s3_make_directories(){
mkdir projects
mkdir projects/git
mkdir projects/backup
}

function s4_create_6_files(){
touch projects/linux{1_centos,2_centos,1_redhat,2_redhat,1_c_programming,2_c_programming}
}

function s5_make_directories_in_git(){
mkdir projects/git/linux1
mkdir projects/git/linux2
}

function s6_move_files_to_dir_1_or_2(){
mv projects/linux1_* projects/git/linux1
mv projects/linux2_* projects/git/linux2
}

function s7_create_package_and_campress(){
tar -czvf projects/backup/git.tar.gz projects/git
}

function s8_delete_dir_git(){
rm projects/git
}

function s9_recover_from_git_tar_gz_backup(){
tar -zxvf projects/backup/git.tar.gz projects
}

function s10_create_package_and_compress(){
tar -jcvf projects/backup/git.tar.bz2 projects/git
}

function s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
find projects |sort
}

function s12_get_next_15_minutes_boundary(){
date+"%Y-%m-%d %H:%M:%S" --date="+15minute"
}
